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Switch default NCB cache policy to MergingIdempotent (i.e. Normal, non-cacheable)
Jeffrey Lee authored 
Detail:
  s/ARMops - Change VMSAv6 cache policy mapping so that default NCB policy maps to Normal, non-cacheable memory rather than Device memory. This allows unaligned accesses to work, and also delivers some major performance improvements for some activities (write performance seems about 2x better than Device)
  Docs/HAL/ARMop_API - Wrap the new barrier ARMop description text to match the rest of the file
Admin:
  Tested on ARM11, Cortex-A7, -A8, -A9
  Note - relaxed memory consistency rules for Normal vs. Device mean that now more than ever, developers authoring device drivers for ARMv6+ need to be careful to use memory barriers in all the right places (preferably the new ARMop barriers exposed by OS_MMUControl 2 to ensure compatibility with all machines)


Version 5.35, 4.79.2.280. Tagged as 'Kernel-5_35-4_79_2_280'
4dff21b8
Name Last commit Last update
..
5thColumn RISC OS 3.71 kernel changes merged.
HAL Switch default NCB cache policy to MergingIdempotent (i.e. Normal, non-cacheable)
MemMaps RISC OS 3.71 kernel changes merged.
PrivDoc RISC OS 3.71 kernel changes merged.
!ReadMe Import from cleaned 370 CD
0197276.02 Import from cleaned 370 CD
32bit * Converted to building with ObjAsm (but still a single object file using ORG).
32bitAPIs Commit of kernel as featured in release 5.00.
A540Extend Import from cleaned 370 CD
AMBControl Import from cleaned 370 CD
CallbackChange Miscellaneous stuff.
GraphicsV Merged in changes from Castle
HiResTTX Added 256-colour version of the (high-resolution only) teletext code, and support for teletext when hardware scroll is disabled. Both are required for Tungsten.
Kernel Import from cleaned 370 CD
KernlSplit Import from cleaned 370 CD
MMUControl Import from cleaned 370 CD
ModPostServ HAL device support, and a couple of new service calls.
Mode22 Import from cleaned 370 CD
Modes Import from cleaned 370 CD
MonLead Import from cleaned 370 CD
PageFlags Lots of Tungsten work.
PaletteV Import from cleaned 370 CD
RO370 Lots of Tungsten work.
ReadSysInf Lots of Tungsten work.
ReadUnsigned Merge over some changes from the Cortex branch
TVmodesMed,dde